The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 05, 2007
Filed:
Feb. 14, 2005
Applicant:
Takahiko Yoshinaga, Takatsuki, JP;
Inventor:
Takahiko Yoshinaga, Takatsuki, JP;
Assignee:
Matsushita Toshiba Picture Display Co., Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J 29/70 (2006.01);
U.S. Cl.
CPC ...
Abstract
A deflection device for a projection tube includes a main deflection device for generating a raster and an auxiliary deflection device for correcting a convergence. The auxiliary deflection device includes a toroidal auxiliary horizontal coil, a saddle-type auxiliary vertical coil, and a ferrite core. According to this configuration, the deflection efficiency is enhanced, and pincushion distortion in upper and lower portions can be corrected efficiently while a change in the shape of a beam spot is reduced.